CN104929765B - Stepless speed regulating single-piston type hydraulic free piston engine - Google Patents
Stepless speed regulating single-piston type hydraulic free piston engine Download PDFInfo
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- CN104929765B CN104929765B CN201510387698.1A CN201510387698A CN104929765B CN 104929765 B CN104929765 B CN 104929765B CN 201510387698 A CN201510387698 A CN 201510387698A CN 104929765 B CN104929765 B CN 104929765B
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Abstract
The invention discloses a stepless speed regulating single-piston type hydraulic free piston engine and belongs to the technical field of hybrid power. The hydraulic free piston engine comprises a high-voltage energy accumulator, a low-voltage energy accumulator, a constant power transformer, a control valve, an air cylinder body, an oil atomizer and a piston component. The air cylinder body provides a mounting cavity of the piston component, and accordingly a piston oil cavity, a starting oil cavity and a scavenging chamber are formed. A port A of the constant power transformer is connected with the high-voltage energy accumulator. A port C is connected with the low-voltage energy accumulator. A port B is communicated with the piston oil cavity. The control valve is arranged, so that when the hydraulic free piston engine is in a starting working condition, the high-voltage energy accumulator is communicated with the starting oil cavity. In a first stroke and a second stroke, the low-voltage energy accumulator is communicated with the starting oil cavity. The engine generates pressure changing through the constant power transformer, so that hydraulic energy and fuel burning heat energy are directly converted, and meanwhile by changing the port pressure of the constant power transformer, stepless speed regulating of the free piston engine can be achieved.
Description
Technical field
The present invention relates to a kind of free-piston engine, and in particular to a kind of stepless speed regulation single-piston hydraulic free-piston
Engine, belongs to technical field of hybrid power.
Technical background
With increasingly manifesting for global energy crisis and environmental degradation problem, the energy-conservation and environmental-protecting performance to engine will
Ask and also improve constantly.Developing rapidly and applying with ic engine industry simultaneously, structure, efficiency, work(of the people to power set
Rate density and disposal of pollutants have higher and higher requirement.On the one hand people are devoted to the improvement to conventional engines and complete
It is kind, new power set of on the other hand seek assiduously.Hydraulic free-piston engine is exactly to grow up under this overall background
New special internal combustion engine.Hydraulic free-piston engine is modern hydraulic technology, microelectric technique, control technology and internal combustion engine
The synthesis of technology.Hydraulic free-piston linear motor realizes the past of piston by the fuel feeding of accumulator and the work by combustion of fuel
Multiple motion, in the course of work compression ratio can with flexible modulation, with power density it is high, fuel type is wide, exhaust emission is light etc. dives
In advantage.Therefore hydraulic free-piston engine has higher practical value and preferable development prospect.
Nowadays with regard in hydraulic free-piston engine research work, the reasonability design of its structure and optimization are also it
One important directions of development.Existing hydraulic free-piston linear motor has that structure is not compact, processing technology is poor, control
The deficiencies such as complexity processed.The free-piston engine of opposed piston and dual Piston existing at present, both arrangements
The arrangement of middle piston can cause the axial dimension of piston component excessive so that hydraulic free-piston engine structure is not tight
Gather, the shortcomings of the processing technology of piston component is deteriorated.
Meanwhile, in hydraulic free-piston engine evolution, improve the target that efficiency is always everybody pursuit.Hydraulic pressure
Free-piston engine is that a kind of be integrated fuel burner and hydraulic means organic integration is realized the chemical energy of fuel
It is converted into the device of hydraulic energy.Nowadays it is many with regard to hydraulic free-piston engine invention in, during energy is changed,
Mechanism is complicated, and conversion is loaded down with trivial details, there is many losses, seriously reduces the efficiency of hydraulic free-piston engine.
The content of the invention
In view of this, the present invention proposes a kind of stepless speed regulation single-piston hydraulic free-piston engine, using permanent work(
Rate potential device, can shorten energy transmission chain, simplify structure, using single-piston formula structure, make engine structure compact.Together
When, the pressure for changing invariable power transformer port can be passed through, realize the function of engine stepless speed regulation.
The stepless speed regulation single-piston hydraulic free-piston engine includes：High pressure accumulator, low pressure accumulator, invariable power
Transformer, cylinder block, fuel injector and piston component；The piston component include be sequentially connected cylinder piston, piston rod and
Pump piston；The invariable power transformer has three ports, respectively port A, port B and port C.
Its annexation is：The piston component is located in cylinder block cavity；The cylinder block foundation intracavity diameter is not
Together, three sections are divided into vertically, respectively cylindrical portion A, cylindrical portion B and cylindrical portion C；Wherein cylindrical portion B with diameter greater than cylindrical portion A
Diameter；The pump piston is the disc-shaped structure matched with the internal diameter of the cylindrical portion；The cylinder piston is and the cylindricality
The disc-shaped structure of the internal diameter matching of section A；The inner chamber of cylindrical portion C for the dividing plate that piston rod is passed through by being only divided into chamber
A and chamber B, the pump piston is located in chamber B, chamber B is divided into into piston oil pocket and starts oil pocket, wherein described start oil
Chamber is the chamber between the dividing plate and pump piston；The inner chamber of cylindrical portion A is scavenging room, at the interior bottom corresponding to scavenging room
Fuel injector and valve are provided with face；The periphery of the chamber A is provided with breather check valve.
The port A of the invariable power transformer is connected by oil circuit with high pressure accumulator, and port C is stored by oil circuit with low pressure
Energy device is connected, and port B is connected by oil circuit with the piston oil pocket；
Additionally, make the hydraulic free-piston engine in start operating performance by arranging control valve, the high pressure accumulator
Connect with oil pocket is started；In the first stroke and the second stroke, the low pressure accumulator is connected with oil pocket is started.
Axially arranged have for the guide wall that play the guiding role to the movement of cylinder piston along its in cylindrical portion B；
Two or more air-vent is provided with the periphery of the guide wall.
Beneficial effect：
(1) invariable power transformer is adopted in the hydraulic free-piston engine kind, energy transmission chain can be shortened, simplified and send out
The structure of motivation, lifts engine efficiency and reliability.
(2) can change the characteristics of motion of piston component by adjusting the port pressure of invariable power transformer, solid line without
Level speed governing, while the compression ratio of flexibly changing engine.
(3) using single-piston formula structure, engine compact overall structure is made, tiny engine can be made, can extensively be answered
For fields such as micro-robot, vehicles.
Description of the drawings
Fig. 1 is the structural representation of the first embodiment of the free-piston engine；
Fig. 2 is the start operating performance schematic diagram of the free-piston engine；
Fig. 3 is each position of components figure in the first stroke cylinder body；
Fig. 4 is each position of components figure in the second stroke cylinder body；
Fig. 5 is the structural representation of hollow out guide wall；
Fig. 6 is the structural representation of second embodiment of the free-piston engine.
Wherein：1- high pressure accumulators, 2- invariable power transformers, 3- control valve A, 4- start oil pocket, 5- breather check valves, 6-
Cylinder block, 7- scavengings room, 8- valves, 9- fuel injectors, 10- cylinder pistons, 11- guide walls, 12- piston rods, 13- control valve B,
14- pump pistons, 15- piston oil pockets, 16- low pressure accumulators, 17- control valve C
Specific embodiment
Develop simultaneously below in conjunction with the accompanying drawings embodiment, describes the present invention.
The present embodiment provides a kind of stepless speed regulation single-piston hydraulic free-piston engine, by invariable power potential device
The pressure change of generation causes hydraulic energy directly to convert with fuel combustion heat energy, can solve the problem that existing straight line starts structure not tight
Gather, control complexity, energy transfer mechanism is complicated, the low problem of the thermal efficiency.By the pressure reality for changing invariable power transformer two ends
The function of stepless speed regulation of existing piston.
Embodiment 1：
The hydraulic free-piston engine includes：High pressure accumulator 1, low pressure accumulator 16, invariable power transformer 2, control
Valve A3, control valve B13, cylinder block 6, fuel injector 9 and piston component.Wherein cylinder block 6 is body, high pressure accumulator 1 and low pressure
Accumulator 16 is energy storage device, and piston component includes cylinder piston 10, piston rod 12 and the pump piston 14 being sequentially connected.Permanent work(
Rate transformer 2 has three ports, respectively port A, port B and port C.
Its integrated connection relation is as shown in figure 1, the cylinder block 6 is hollow column construction, there is provided the peace of piston component
It behave affectedly.The cylinder block 6 can vertically be divided into three sections according to the difference of diameter, and cylindrical portion A, cylindrical portion B are followed successively by from left to right
With cylindrical portion C, wherein cylindrical portion B with diameter greater than cylindrical portion C and the diameter of cylindrical portion A.The pump piston 14 is and the post
The disc-shaped structure of the internal diameter matching of shape section C, the cylinder piston 10 is the disc knot matched with the internal diameter of cylindrical portion A
Structure.The inner chamber of cylindrical portion C is divided into chamber A and chamber B, the pump piston 14 by the dividing plate for only passing through for piston rod 12
In chamber B, chamber B is divided into into piston oil pocket 15 and starts oil pocket 4, wherein it is that the dividing plate is lived with pump to start oil pocket 4
Chamber between plug 14.The inner chamber of cylindrical portion A is scavenging room 7, and on the inner bottom surface corresponding to scavenging room 7 oil spout is provided with
Device 9 and valve 8.The perforate on the periphery of the chamber A, and tapping is provided with breather check valve 5, breather check valve 5
Effect be live gas is filled with scavenging room 7.Axially arranged have for cylinder piston 10 along its in cylindrical portion B
The guide wall 11 that play the guiding role of movement, multiple air-vents are machined with the guide wall 11, it is unidirectional from air inlet so as to ensure
The live gas that valve 5 is come in can enter scavenging room 7, and (glide path of gas is：Breather check valve 5- air-vents-guide wall 11
Toroidal cavity-air-vent-scavenging room between cylindrical portion B).
The high pressure accumulator 1 is connected respectively by two oil circuits with the port A and startup oil pocket 4 of invariable power transformer 2；
Arrange on the oil circuit that oil pocket 4 is connected control valve A with starting at it.The valve A that controls is two three-way electromagnetic valves, when it is located at a left side
During position, high pressure accumulator 1 is connected with oil pocket 4 is started, and when it is located at right position, the oil circuit ends at control valve A.The low pressure
Accumulator 16 is connected respectively by two oil circuits with the port C and piston oil pocket 15 (or starting oil pocket 4) of invariable power transformer 2；
Control valve B is set on the oil circuit that it is connected with piston oil pocket 15.The valve B that controls is 2/2-way magnetic valve, when it is located at
When upper, the low pressure accumulator 16 is connected with oil pocket 4 is started；When it is located at bottom, the low pressure accumulator 16 and piston
Oil pocket 15 is connected.The port B of the invariable power transformer 2 is directly connected with piston oil pocket 15.
The effect of the invariable power transformer 2 is in its port A different with port B generations pressure so that fluid is from end
Mouth C flows into low pressure accumulator 16 or by the fluid supply high pressure accumulator 1 in low pressure accumulator 16, reaches reduction energy transmission
Chain, optimizes structure, improves the purpose of the thermal efficiency.Meanwhile, changing the port pressure of invariable power transformer can realize engine
Function of stepless speed regulation.
The operation principle of the free-piston engine is illustrated with reference to Fig. 2 to Fig. 5：
The free-piston engine includes internal combustion engine part and hydraulic part, and wherein internal combustion engine part adopts two-stroke diesel
Machine operation principle, uniflow scavenging mode；Hydraulic part provides the energy storage that energy simultaneously produces expansion stroke for compression stroke
Deposit to accumulator.In the course of work, the piston component formed from cylinder piston 11, pump piston 14 and piston rod 12 do circulation toward
Linear motion.In compression stroke, the port A of the fluid Jing invariable powers transformer 2 flowed out from high pressure accumulator 1 flows into permanent work(
Rate transformer 2, the pressure of the port B of invariable power transformer 2 is higher than port A, and fluid point two-way flows into pump and lives from its port B all the way
Plug oil pocket 15, for internal combustion engine compression stroke energy is provided, and another Lu Congqi ports C flows into low pressure accumulator 16.In expansion stroke
In, the port A reduced pressure of invariable power transformer 2, the fluid of pump piston oil pocket 15 is with the fluid of low pressure accumulator 16 in invariable power
The port A of transformer 2 confluxes, and completes power output.In piston component motion process, it is made to move right to its range
When, the position of cylinder piston 10 be its bottom dead center position, position as shown in Figure 3；When making it move to its range to the left,
The position of cylinder piston 10 be its top dead center position, position as shown in Figure 4.
Before startup, because cylinder piston 11 can be located at the optional position of scavenging room 7, therefore cylinder need to be made by start operating performance
Piston 10 is moved to ad-hoc location.Such as open before start operating performance, the position of piston component is as shown in Figure 2.First control valve A3 is moved
To left position, control valve B13 moves to bottom, while invariable power transformer 2 is closed, now high pressure accumulator 1 passes through oil circuit and opens
Dynamic oil pocket 4 is connected, and pump piston oil pocket 15 is connected by oil circuit with low pressure accumulator 16.High pressure accumulator 1 injects high-voltage oil liquid
Start oil pocket 4, start the high-voltage oil liquid in oil pocket 4 and promote pump piston 14 to move right, i.e., piston component is migrated to the right dynamic.Living
During plug assembly moves right, pump piston 14 is by the fluid press-in low pressure accumulator 16 in pump piston oil pocket 15.Work as cylinder
When piston 10 moves right to its bottom dead center position, start operating performance terminates.Now position of the piston component in cylinder block 6 is as schemed
Shown in 3.
After start operating performance terminates, adjustment control valve A3 is located at right position, and control valve B13 is located at upper, and opens valve 8, such as
Shown in Fig. 3；Engine enters the first stroke, and now low pressure accumulator 16 is connected with oil pocket 4 is started.High pressure accumulator 1 is to permanent work(
The port A injection high pressure liquid force feeds of rate transformer 2, its port A pressure is less than port B pressure, and due to invariable power transformer 2
Power invariability so that high pressure liquid force feed shunting in invariable power transformer 2, all the way through port C inflow low pressure accumulators 16, one
Road flows into pump piston chamber 15 through port B, and so as to promote pump piston 14 to left movement, i.e., piston component is to left movement so that gas
Cylinder piston 10 is moved from bottom dead center position to top dead center position.In the process, the air in scavenging room 7 is outside by valve 8
Discharge, extraneous fresh air enters scavenging room 7 by breather check valve 5, so as to realize ventilation.In pump piston 14 to left movement
During, the startup fluid started in oil pocket 4 is flowed into into low pressure accumulator 16 through control valve 14.The fluid in the first stroke
Glide path as indicated by the arrows in fig. 3.(work as cylinder piston in this example when cylinder piston 10 is moved to the left setting position
10 transition positions for being moved to cylindrical portion A and cylindrical portion B) when, valve 8 and breather check valve 5 are closed, now scavenging room 7 becomes envelope
The cavity for closing, into compression stroke.In compression stroke, cause in scavenging room 7 because cylinder piston 10 continues to be moved to the left
Air is compressed, and when close its top dead center position of cylinder piston 10, starts fuel injector 9 and fuel oil and voluntarily is sprayed into air chamber
Ignition, the pressure, temperature in air chamber is drastically raised.
When cylinder piston 10 is moved to its top dead center position, now position of the piston component in cylinder block 6 such as Fig. 4 institutes
Show.Engine completes the work of the first stroke, into the second stroke.Because now scavenging room 7 is interior for high temperature, gases at high pressure, cylinder
Piston 10 is moved from left to right in the presence of high temperature, gases at high pressure, i.e., from top dead center position to bottom dead center position, externally
Acting, is now expansion stroke.Low due to starting the pressure in oil pocket 4 in expansion stroke, low pressure accumulator 16 is oily to starting
Punching oil in chamber 4, port B of the pump piston 14 by the high-voltage oil liquid in pump piston chamber 15 through invariable power transformer 2 is exported, due to
In expansion stroke, the pressure of the port B of invariable power transformer 2 is much larger than the pressure of its port A, then in the domestic demand of invariable power transformer 2
Low pressure accumulator is wanted to feed a certain amount of fluid from port C, then fluid confluxes in its port A, externally output acting.Now fluid
Flow direction as shown by the arrows in figure 4.When cylinder piston 10 moves right to its 2/3 stroke, valve 8, expansion are opened
Stroke terminates, and discharges the waste gas in air chamber, and inner pressure of air cylinder, temperature are reduced so that extraneous air is entered by breather check valve 5
Enter scavenging 7 and air chamber, realize ventilation.When cylinder piston 10 moves right to its bottom dead center position, the second stroke terminates, extremely
This completes a working cycles, realize by the heat energy of fuel combustion by piston component be converted into hydraulic energy be stored in high pressure store
Export in energy device 1 and externally acting.
Embodiment 2：
The hydraulic free-piston engine includes：High pressure accumulator 1, low pressure accumulator 16, invariable power transformer 2, control
Valve C18, cylinder block 6, fuel injector 9 and piston component.Wherein cylinder block 6 is body, and high pressure accumulator 1 and low pressure accumulator 16 are
Energy storage device, piston component includes cylinder piston 10, piston rod 12 and the pump piston 14 being sequentially connected.Invariable power transformer 2
With three ports, respectively port A, port B and port C.
Its integrated connection relation is as shown in Fig. 2 the cylinder block 6 is hollow column construction, there is provided the peace of piston component
It behave affectedly.The cylinder block 6 can vertically be divided into three sections according to the difference of diameter, and cylindrical portion A, cylindrical portion B are followed successively by from left to right
With cylindrical portion C, wherein cylindrical portion B with diameter greater than cylindrical portion C and the diameter of cylindrical portion A.The pump piston 14 is and the post
The disc-shaped structure of the internal diameter matching of shape section C, the cylinder piston 10 is the disc knot matched with the internal diameter of cylindrical portion A
Structure.The inner chamber of cylindrical portion C is divided into chamber A and chamber B, the pump piston 14 by the dividing plate for only passing through for piston rod 12
In chamber B, chamber B is divided into into piston oil pocket 15 and starts oil pocket 4, wherein it is that the dividing plate is lived with pump to start oil pocket 4
Chamber between plug 14.The inner chamber of cylindrical portion A is scavenging room 7, and on the inner bottom surface corresponding to scavenging room 7 oil spout is provided with
Device 9 and valve 8.The perforate on the periphery of the chamber A, and tapping is provided with breather check valve 5, breather check valve 5
Effect be live gas is filled with scavenging room 7.Axially arranged have for cylinder piston 10 along its in cylindrical portion B
The guide wall 11 that play the guiding role of movement, multiple air-vents are machined with the guide wall 11.
The high pressure accumulator 1 is connected respectively by two oil circuits with the port A and startup oil pocket 4 of invariable power transformer 2；
Arrange on the oil circuit that oil pocket 4 is connected control valve C17 with starting at it.The valve C17 that controls is 2/2-way magnetic valve, when its position
When left position, high pressure accumulator 1 is connected with oil pocket 4 is started, and when it is located at right position, low pressure accumulator 16 connects with oil pocket 4 is started
It is logical.The low pressure accumulator 16 is connected by oil circuit with the port C of invariable power transformer 2；The port B of invariable power transformer 2 is straight
Connect and connected with piston oil pocket 15.
Above-described embodiment 2 is the modified scheme of embodiment 1, and relative to embodiment 1 a control valve is eliminated, and simplifies
Operate, its operation principle and process are same as Example 1.
In sum, presently preferred embodiments of the present invention is these are only, is not intended to limit protection scope of the present invention.
All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in the present invention's
Within protection domain.
Claims (4)
1. a kind of stepless speed regulation single-piston hydraulic free-piston engine, it is characterised in that include：It is high pressure accumulator (1), low
Pressure accumulator (16), invariable power transformer (2), cylinder block (6), fuel injector (9) and piston component；The piston component include according to
Secondary connected cylinder piston (10), piston rod (12) and pump piston (14)；The invariable power transformer (2) is with three ends
Mouthful, respectively port A, port B and port C；
Its annexation is：The piston component is located in cylinder block (6) cavity；The cylinder block (6) is according to intracavity diameter
Difference, is divided into vertically three sections, respectively cylindrical portion A, cylindrical portion B and cylindrical portion C；Wherein cylindrical portion B with diameter greater than cylindrical portion A
Diameter；The pump piston (14) is the disc-shaped structure matched with the internal diameter of cylindrical portion C；The cylinder piston (10) is
The disc-shaped structure matched with the internal diameter of cylindrical portion A；The inner chamber of cylindrical portion C for piston rod (12) by only passing through
Dividing plate be divided into chamber A and chamber B, the pump piston (14) in chamber B, by chamber B be divided into piston oil pocket (15) and
Start oil pocket (4), wherein startup oil pocket (4) is the chamber between the dividing plate and pump piston (14)；Cylindrical portion A
Inner chamber is scavenging room (7), and fuel injector (9) and valve (8) are provided with the inner bottom surface corresponding to scavenging room (7)；In the chamber
The periphery of room A is provided with breather check valve (5)；
The port A of the invariable power transformer (2) is connected by oil circuit with high pressure accumulator (1), and port C is by oil circuit and low pressure
Accumulator (16) is connected, and port B is connected by oil circuit with the piston oil pocket (15)；
Additionally, make the hydraulic free-piston engine in start operating performance by arranging control valve, the high pressure accumulator (1) with
Start oil pocket (4) connection；In the first stroke and the second stroke, the low pressure accumulator (16) connects with oil pocket (4) is started；Institute
State start operating performance and refer to that cylinder piston (10) is moved to the process of its bottom dead center position by initial position；First stroke refers to cylinder
Piston (10) is moved to the process of its top dead center position by bottom dead center position, and second stroke refers to that cylinder piston (10) is stopped by upper
Point position is moved to the process of its bottom dead center position；When the bottom dead center position refers to that piston component is moved right to its range
Position, the position when top dead center position refers to that piston component moves to the left its range.
2. stepless speed regulation single-piston hydraulic free-piston engine as claimed in claim 1, it is characterised in that by arranging
Control valve A (3) and control valve B (13) make the hydraulic free-piston engine in start operating performance, high pressure accumulator (1) and startup
Oil pocket (4) is connected；In the first stroke and the second stroke, the low pressure accumulator (16) connects with oil pocket (4) is started；Specifically
For：
The high pressure accumulator (1) is provided by controlling the oil circuit of valve A (3) and is connected with startup oil pocket (4)；The control valve A
(3) it is two three-way electromagnetic valves, when it is located at left position, the high pressure accumulator (1) connects with oil pocket (4) is started, when its position
When right position, the oil circuit cut-off；Control valve B (13) is 2/2-way magnetic valve, when it is located at it is upper when, the low pressure stores
Energy device (16) is connected with oil pocket (4) is started；When it is located at bottom, the low pressure accumulator (16) and the piston oil pocket (15)
Connection.
3. stepless speed regulation single-piston hydraulic free-piston engine as claimed in claim 1, it is characterised in that by arranging
Control valve C (18) makes the hydraulic free-piston engine in start operating performance, and high pressure accumulator (1) is connected with oil pocket (4) is started；
In the first stroke and the second stroke, the low pressure accumulator (16) connects with oil pocket (4) is started；Specially：
The high pressure accumulator (1) is provided by controlling the oil circuit of valve C (18) and is connected with startup oil pocket (4)；The control valve C
(18) it is 2/2-way magnetic valve, when it is located at left position, the high pressure accumulator (1) connects with oil pocket (4) is started, when its position
When right position, the low pressure accumulator (16) connects with oil pocket (4) is started.
4. the stepless speed regulation single-piston hydraulic free-piston engine as described in claim 1,2 or 3, it is characterised in that
Axially arranged have for the guide wall (11) that play the guiding role to the movement of cylinder piston (10) along its in cylindrical portion B；Institute
Two or more air-vent is provided with the periphery for stating guide wall (11).
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| CN201510387698.1A CN104929765B (en) | 2015-07-03 | 2015-07-03 | Stepless speed regulating single-piston type hydraulic free piston engine |
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| CN201510387698.1A CN104929765B (en) | 2015-07-03 | 2015-07-03 | Stepless speed regulating single-piston type hydraulic free piston engine |
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| CN107150956A (en) * | 2017-06-26 | 2017-09-12 | 宁波卓益控制技术有限公司 | A kind of all-hydraulic control driving system based on accumulator and variable displacement motor |
| CN110469418B (en) * | 2019-08-23 | 2020-07-03 | 济南天易迅达电气科技有限公司 | Free piston engine fuel injection method based on two-time fuel injection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102705076A (en) * | 2012-06-19 | 2012-10-03 | 吉林大学 | Return flow scavenging type hydraulic free piston diesel engine |
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| US6293231B1 (en) * | 1999-09-29 | 2001-09-25 | Ingo Valentin | Free-piston internal combustion engine |
| NL1013996C2 (en) * | 1999-12-30 | 2001-07-03 | Innas Free Piston Bv | Free piston unit for generating hydraulic energy. |
| CN101566106B (en) * | 2008-12-12 | 2012-07-25 | 北京理工大学 | Compression stroke realization device of two-stroke hydraulic free piston engine |
| CN204175430U (en) * | 2014-10-17 | 2015-02-25 | 华侨大学 | A kind of free-piston engine |
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| CN102705076A (en) * | 2012-06-19 | 2012-10-03 | 吉林大学 | Return flow scavenging type hydraulic free piston diesel engine |
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